Write history files after one timestep simulation CESM1.0.4

[amatcaos@caos_iisc_ernet_in]

HiI wonder if someone can help me .I am using CESM1.0.4.  I was doing a run and writing monthly history files. I completed few years of simulation, now I am trying to write history files after one timestep simulation. It is not a branch or hybrid run, I am just continuing the runs. But I am not getting the history file written after one timestep. I have changed nhtfrq = 1 and mfilt = 1 in the cam namelist like this:
...&cam_inparm
 bnd_topo               = '$DIN_LOC_ROOT/atm/cam/topo/USGS-gtopo30_1.9x2.5_remap_c050602.nc'
 cam_branch_file                = ' '
 dtime          = 1800
 ncdata         = '$DIN_LOC_ROOT/atm/cam/inic/fv/cami-mam3_0000-01-01_1.9x2.5_L30_c090306.nc'
 print_energy_errors            = .false.
 mfilt = 1
 nhtfrq(1) = 1...
What else I should change to get history files written after on timestep.Thanks Ansghuman

 

[eaton]

A branch run is the only way to do this.  A branch is an exact restart that allows changes to the history output streams.